Q.): I understand that one should be in the state of wudu when one touches the Qur’an. However, does one also have to be in wudu to recite the Quran e.g. from memory, or if one has downloaded the Quran on their mobile phone or computer? Also, what is the ruling regarding other Quranic literature such as a book of selected surahs, a book of a single chapter of the Quran, a book containing the (non-Arabic) translation of the entire Quran, etc?

A.)
It is not necessary to have Wudu when reciting the Qur'an from memory or from the mobile phone or computer.

It is necessary to have Wudu when touching Qur'anic literature such as a book of selected Surahs or one chapter of the Qur'an.